![]() ![]() This can be due to the system no longer having network credentials to access the file. If a user attempts to restore the file after quarantine, that file might not be accessible. Defender for Endpoint will restore all custom blocked files that were quarantined on this device in the last 30 days.Ī file that was quarantined as a potential network threat might not be recoverable. In some scenarios, the ThreatName may appear as EUS:Win32/CustomEnterpriseBlock!cl. Remove a file from quarantine across multiple devices In the pane on the right side of the screen, select Undo. On the History tab, select the actions that you want to undo. (To learn more, see Undo completed actions.) If the action cannot be undone with this method, you will not see an Undo button. On the History tab, select an action that you want to undo. ![]() Restore a quarantined file from the Action Center ![]() Select an item to view more details about the remediation action that was taken. Select the History tab to view a list of actions that were taken. In the left navigation pane of the Microsoft 365 Defender portal, click Action center. When you're done reviewing and undoing actions that were taken as a result of false positives, proceed to review or define exclusions.
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